Evaporator for refrigerating systems



Patented June 4, 19 35 I V i UNITED STATES PATENT orrics Edmund E. lfy ne i l lfveland, Ohio Original application December 24, 1931, Serial No.583,061. Divided and this application September so, 1933, Serial No.691,716

3 Claims. (01. 62-99) The invention disclosed in this application redomecasing has a suitable top l3 provided with lates to refrigeratingapparatus of the absorption 9. central longitudinal passageway orchannel It type and is a divisional application of my cofor the circuitpipes which enter at the back and pending application, Serial No.583,061, filed Deincline downwardly to the front from the rear.

5 cember 24, 1931, now Patent 1,932,877; The top of the inner shell, thedome casing, and 5 One object of the invention is to provide an the topI 3 are all encased in suitable insulation evaporator which isthoroughly heat insulated as at l5, s. top layer l8 extending over theupper by a vacuum casing except for a small heat transmember of top 83.The refrigerating compartier portion which extends through the vacuumment being less in overall depth than the front 10 casing and isconnected to any suitable freezing to rear dimension of the cabinetleaves a rear 10 unit structure, as for example, a brine tankhavvertical flue channel communicating with the ap ing a socket. for theexposed evaporator portion paratus compartment 8. This flue is utilizedto and a cube tray support in heat transfer relation carry away the heatfrom the still 22 and to con- With the brine tank. tain some of thepieces of apparatus and connec- A further object of the invention is toimprove tions and also house the water tank and main con- 15 absorptionrefrigerating apparatus by providing denser. It is separated into twoflues, H a main the refrigerating compartment with a dome for flue forreceiving the rectifier, water tank, conreceiving' the evaporator and afreezing unit in denser and like parts, and the other an auxiliarylimited heat transfer relation with the evaporator, flue for leadingaway the products of combus- 2.0 and a housing or casing enclosing theevaporator tion from the still and also for housing the hairand freezingunit and provided with an adjustable pin loop and trap.

thermostatic control means for regulating the clr- A rectifier pipebranching into two lntercoro culation of air from the refrigeratingcompart-= nected legs, generally indicated at it, extending meritthrough the casing about the freezing unit through the partition intothe flue ii and there and dome, thereby controlling the temperature ofrising to a point near the top main flue and 25 the refrigeratingcompartment. passing horizontally to the opposite side where Theforegoing and other features oi the inventhey are connected together ina single pipe 32 tion will be brought out in the followingdescripextending upwardly to a point near the top of tion, drawing, andclaims. the cabinet. Here the pipe extends forwardly so Fig. i is avertical section of the apparatus md downwardly into a connectionleading to showing the refrigerator cabinet in cross-section. the dome 8of an evaporator arranged in Fig. 2 is a detail view disclosing theevaporator the heat dome. This evaporator has a relatively incross-section. small downwardly extending heat transfer boss In theembodiment shown in the drawing, the 36 which constitutes substantiallythe only heat cabinet comprises a front i having an upper retransfermeans between the evaporator and the 35 irigerating compartment openingand door 2 and freezing unit 0 a lower apparatus compartment opening andIn order to prevent the excessive absorption of ,door This front isconnected to suitable side heat from the box, the evaporator may becomwalls d of greater depth than the insulated repletely heat insulated,except for the boss 36 40 irlgerating compartment, as will appear. Theseas by providing it with an additional shell or cas- 40 side walls andfront are mounted upon a suitable ing 3t spaced from it and providing aspace open base frame, generally indicated at't. Mountfrom which the airmay be exhausted, or the ed in the forward upper portion of the cabinetspace may be filled with a heat insulatingmethus formed is the outershell. 8 of the reirigeratdiuin, the main point being to substantiallyining compartment which extends to the top of the sulate the evaporatorfrom, and have it wholly 45 cabinet and its bottom l is spaced from thelower within, the refrigerating compartment. frame 5 to provide anapparatus chamber or corn- The connection 33 is inclined downwardlytopartrnent a. Mounted within and spaced Irom ward the evaporator 35 andconnected in its side this outer shell 8 is an inner shell 9 with the toa condenser pipe leading down to a sump con- 5 space between filled withsuitable insulation Ill. nected to the condenser. This inner shell has aceiling H, which is gen- The still is preferably encased in a suitableorally slightly higher than the top of the door hood 4| having a stackportion leading to the and is provided with an upwardly extending heatauxiliary flue and with an opening 53 in the collecting dome casing l2normally in communibottom of the hood to receive the burner and cationwith the refrigerating chamber. This also to permit the passage of airupward around 55 the still. This hood or casing also protects thecompartment 8 against excessive heat from the heating means.

The construction and arrangement of the still, fiues, loop, rectifier,and hood form no part of the present application but are disclosed indetail and claimed in copending application 583,061, filed December 24,1931, now Patent 1,932,877, of which this is a division.

In order to relieve the evaporator of any undue accumulation ofabsorbent or boiler liquor, a suitable drain is employed and it isconnected by a gooseneck comprising the evaporator leg 48, Fig. 2, theupper member 49 leading out of the main flue ll into the auxiliary flueand there entering the bottom of a closed casing mounted upon thestraight portion of the return bend of the hairpin loop communicatingwith the still. The top of this casing is connected by a short smallpipe with a downwardly extending larger pipe portion leading into thepipe at substantially the point slightly above but nevertheless at sucha point with respect to the normal level of the boiler liquor at the endof the refrigerating cycle that it will be sealed at the beginning ofthe heating cycle and thereafter be exposed during the refrigeratingcycle.

Extending down into the box and co-extensive with the open mouth of thedome formed in the top or ceiling of the refrigerating compartment is afreezing unit casing, generally of rectangular form and comprising sides54 and a suitable back 55. At the front there is an inwardly extendingmargin or framework, generally indicated at 56. This rectangular openingis for the reception of the ice trays, as will appear. The sides, back,and front extend out and are provided with flanges 51 engaging the underside of the top H of the refrigerating compartment. held in place bysuitable thumb screws 58. Near the top this casing is provided withsuitable openings 59 for the passage of heated air from the top of therefrigerating compartment into the dome, and at the bottom it isprovided with an opening 60 adapted to be controlled by a damper 6 Ioperated by a suitable thermostat. In this way the circulation of airthrough the freezing unit casing may be regulated.

Mounted in the casin 54 is a freezing unit They are shell 'II' providedwith suitable cleats 1| for supporting cube trays 12. The top of thisshell carries a brine tank 13 having a top 14 provided with a well orsocket 15 adapted to fit the sump boss 38. This fit is somewhatloose-and an emcient-heat transfer medium between the cup on the onehand and the boss on the other is provided by water or mercury. In thisway the direct heat transfer from the evaporator to the freezing unit islimited and is dependent upon the size of the boss and the cup. It hasbeen found by experience that this is'very effective for maintaining thebox at the proper temperature and renders the temperature controllableby the simple regulation of the damper 6|.

What I claim is:

1. In refrigerating apparatus, a cabinet, a heat insulated refrigeratingchamber within said cabinet and having a heat dome extending upwardlyfrom the ceiling thereof, an evaporator in said cabinet and arranged insaid dome, a heat insulated housing having an open front, means forremovably securing said housing to the ceiling of the refrigeratingchamber about the margin of said dome, and .a removable freezing unit inheat transfer relation with said evaporator and arranged in saidhousing.

2. In refrigerating apparatus, a cabinet, a heat insulated refrigeratingchamber within said cabinet, and having its ceiling provided with anupwardly flared heat dome, an evaporator arranged in said chamber, acombined housing and freezing unitcomprising a casing, a freezing unitcomprising an ice tray frame, an upper brine tank mounted in saidcasing, and means for removably securing said unit about the margin ofsaid heat dome with the brine tank in heat transfer relation with saidevaporator.

3. In refrigerating apparatus, a cabinet, a refrigerating compartmentwithin said cabinet and having its top provided with an upwardlyextended heat dome, an evaporator mounted in said dome, a freezing unitsupported by said cabinet and including a brine tank in heat transferrelation with said evaporator, and an outer casing secured to saidcabinet and surrounding said freezing unit, said casing being providedwith suitable draft openings.

EDMUND E. ALLYNE.

